[Cronet] Fix race in UploadDataStream.attachToRequest.

components/cronet/android/test/javatests/src/org/chromium/net/UploadDataProvidersTest.java

Index: components/cronet/android/test/javatests/src/org/chromium/net/UploadDataProvidersTest.java
diff --git a/components/cronet/android/test/javatests/src/org/chromium/net/UploadDataProvidersTest.java b/components/cronet/android/test/javatests/src/org/chromium/net/UploadDataProvidersTest.java
index c03ba84455fb4b56f11d3bf71fcf755d6016ab9a..bc04bceeb8b2bdf3b0d83690b8fa0385fca28a99 100644
--- a/components/cronet/android/test/javatests/src/org/chromium/net/UploadDataProvidersTest.java
+++ b/components/cronet/android/test/javatests/src/org/chromium/net/UploadDataProvidersTest.java
@@ -4,6 +4,7 @@
 
 package org.chromium.net;
 
+import android.os.ConditionVariable;
 import android.os.ParcelFileDescriptor;
 import android.os.StrictMode;
 import android.test.suitebuilder.annotation.SmallTest;
@@ -13,6 +14,8 @@ import org.chromium.base.test.util.Feature;
 
 import java.io.File;
 import java.io.FileOutputStream;
+import java.io.IOException;
+import java.nio.ByteBuffer;
 
 /** Test the default provided implementations of {@link UploadDataProvider} */
 public class UploadDataProvidersTest extends CronetTestBase {
@@ -137,4 +140,38 @@ public class UploadDataProvidersTest extends CronetTestBase {
         assertEquals(200, callback.mResponseInfo.getHttpStatusCode());
         assertEquals(LOREM, callback.mResponseAsString);
     }
+
+    @SmallTest
+    @Feature({"Cronet"})
+    public void testNoErrorWhenCanceledDuringStart() throws Exception {
+        TestUrlRequestCallback callback = new TestUrlRequestCallback();
+        UrlRequest.Builder builder = new UrlRequest.Builder(NativeTestServer.getEchoBodyURL(),
+                callback, callback.getExecutor(), mTestFramework.mCronetEngine);
+        final ConditionVariable first = new ConditionVariable();
+        final ConditionVariable second = new ConditionVariable();
+        builder.addHeader("Content-Type", "useless/string");
+        builder.setUploadDataProvider(new UploadDataProvider() {
+            @Override
+            public long getLength() throws IOException {
+                first.open();
+                // This causes deadlock.
+                // second.block();
+                return 0;
+            }
+
+            @Override
+            public void read(UploadDataSink uploadDataSink, ByteBuffer byteBuffer)
+                    throws IOException {}
+
+            @Override
+            public void rewind(UploadDataSink uploadDataSink) throws IOException {}
+        }, callback.getExecutor());
+        UrlRequest urlRequest = builder.build();
+        urlRequest.start();
+        first.block();
+        urlRequest.cancel();
+        second.open();
+        callback.blockForDone();
+        assertTrue(callback.mOnCanceledCalled);
+    }
 }